We don’t have any Boy Scouts in our family, but we try to travel with as much preparedness as we can stand, which means that we always have a road trip first aid kit stashed in the trunk of our car.

From half-used gauze rolls to expired antibiotic ointments, most American first aid kits have one thing in common: They’re woefully out of date. These kits are meant to be our go-to solution for minor ...